j-j2me-10-4.shtml

从IBM公司收集到的J2me教程,想要开发手机游戏的朋友,可以参考一下

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  介绍</font></b></td><td width="200" align="right"><nobr><font size="1" face="Verdana, Arial, Helvetica">&nbsp;</font><font size="1" face="Verdana, Arial, Helvetica">第 4 页（共 6 页）</font></nobr></td></tr></table><br x="7"><br x="7"><font size="2" face="Verdana, Arial, Helvetica"><p><code style="font-family: Courier New, Courier, monospace; font-size: 12">MIDlet</code>    
        是一个 Java   
        类，它扩展了 <code style="font-family: Courier New, Courier, monospace; font-size: 12">javax.microedition.midlet.MIDlet</code>   
        抽象类。实现 <code style="font-family: Courier New, Courier, monospace; font-size: 12">startApp()</code>、<code style="font-family: Courier New, Courier, monospace; font-size: 12">pauseApp()</code>和 <code style="font-family: Courier New, Courier, monospace; font-size: 12">destroyApp()</code>方法，这些方法类似于 J2SE 的 <code style="font-family: Courier New, Courier, monospace; font-size: 12">java.applet.Applet</code> 类中的 <code style="font-family: Courier New, Courier, monospace; font-size: 12">start()</code>、<code style="font-family: Courier New, Courier, monospace; font-size: 12">stop()</code>和 <code style="font-family: Courier New, Courier, monospace; font-size: 12">destroy()</code>方法。
</p><p>除了扩充  
       <code style="font-family: Courier New, Courier, monospace; font-size: 12">javax.microedition.midlet.MIDlet   
        </code> 的主 <code style="font-family: Courier New, Courier, monospace; font-size: 12">MIDlet   
        </code> 类之外，一个 MIDP   
        应用程序通常还包括其它一些类，这些类能随它们的资源一起被打包成为 jar   
        文件 --   
        称之为 <i>MIDlet 套件</i>。一个 MIDlet   
        套件中的不同 MIDlet   
        能共享 jar 文件的资源，尽管不同套件中的 MIDlets   
        不能直接相互作用。
</p><p>MIDlet 在应用程序生命周期中有三种可能的存在状态 -- 运行状态、暂停状态、销毁状态。<i>运行状态</i>，正如其名称所暗示的，意味着 MIDlet 正在运行中。这种状态始于 <code style="font-family: Courier New, Courier, monospace; font-size: 12">startApp</code>  方法被调用时。在<i>暂停状态</i>中，MIDlet 持有的所有资源将被释放，但是它准备着再次被运行。调用 <code style="font-family: Courier New, Courier, monospace; font-size: 12">notifyPaused</code> 方法时，MIDlet 处于暂停状态。在<i>销毁状态</i>中，MIDlet 已经永久地将其自身关闭，释放所有的资源，等待着废物清理程序的处理。它是通过 <code style="font-family: Courier New, Courier, monospace; font-size: 12">notifyDestroyed</code> 方法来调用的。
</p><p>在接下来的两页中，我们来看一个简单的  
       HelloWorld MIDlet。
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